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Reports calls to <code>equals()</code> where the target and argument are
of incompatible types.
<p>While such a call might theoretically be useful, most likely it is a bug.</p>
<p><b>Example:</b></p>
<pre><code>
  new HashSet&lt;String&gt;().equals(new TreeSet&lt;Integer&gt;());
</code></pre>
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